i need help please

I live in canada and Im using this trick to paint...
but something I dont understand and noone ad that problem...
I bought tremclad+ mineral spirit....when I put 50% paint and 50% mineral spirit in the tray to paint...
I roll and start painting the car but the paint wont even stay on the car....
the mineral makes the paint go away...

When I split it in a bucket it was 50% was on top and 50% was on bottom..it doesnt mixed,,,
can you hel pme^ whats the problem???


because now it rained this night and this morning the car was having alots or like (goutte de pluie and coulissE)

well thx for helping me and desperate now

no I dont have a garage

So I just painted the car with the paint, no mineral...since the 2 togther didnt worked